Earth boring tool



June 7, 1932. STROSNIDER 1,862,068

' EARTH BORING TOOL Filed Nov. 1'7, 1930 Patented June 7, 1932 LUTHERSTROSNIDER, OF ONAGA, KANSAS, ASSIGNOB OF ONE-FOURTH TO J; M. EVERTS, OFGENTRALIA, KANSAS, ONE-FQUBTH TO EDWARD MILLER, 01 ONAGA, KANSAS, ANDONE-FOURTH TO H. A. GRUTZIvIACI-IEB, 0F ONAGA, KANSAS EARTH Bonnie moor.

Application filecl November 17, 1930. Serial No. 496,221.

This invention relates to a tool designed primarlly for boring smallholes in hard earth or soft rock. It is especially advantageous a meansfor boring holes used for holding explosives in blasting stumps, softrock, earth banks, and the like.

t is an object of the invention to provide a tool of simple andinexpensive construction which will not only cut into the dirt or rockin the same manner as an auger but will also slightly ream the hole togradually enlarge it as the tool enters or advances.

another object is to provide a tool of this character which is of sturdyconstruction utilizing blades which can be sharpened readily and whichare duplicates.

lVith the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed, may be made within thescope of what is claimed without departing from the spirit of theinvention.

In the accompanying drawing the preferred form of the invention has beenshown.

In said drawing:

Figure 1 is a front elevation of the tool, a portion of the shank beingbroken away.

Figure 2 is a side elevation.

Figure 3 is an end elevation.

Figure 4- is a section on line 41- 1:, Figure 2.

Figure 5 is a section on line 55, Figure '2.

Referring to the figures by characters of reference, 1 designates theshank of the tool which can be of any desired length and is formedpreferably of pipe. To one end of the shank is secured a handle or grip2 while the other end is extended between the transversely bowedattaching ends or faces 3 of the blades of the tool.

As before stated the bladesforming a part of the tool are duplicates.The blades are oppositely disposed and the description of one will applyto both. Each blade includes an intermediate cutting portion which isstraight from end to end and merges at its Upper end along a curved lineinto the attaching portion 3 as indicated at 5. The lower portion ofeach blade iscurved laterally as shown at 6 and the straight cutting orad vancing edge 7 of the portion 4i merges into a curved cutting edge 8which extends to a 1 point 9 at the end of the blade. 4

The curved pointed end portions f the two blades are crossedas indicatedat 10 and that portion ofthe back edge of each curved end 6 whichprojects below the opposed curved portion 6 is beveled to a cutting edge11. This cutting edge extends to the point 9.

That-portion of the back edge and each of the curved parts 6 locatedabove the point of crossing indicated at 10 is blunt as shown I at 12.

The two blades 4 are bowed transversely and are tapered downwardly to aslight eX- tent toward their point of crossing. The straight cuttingedge 7 of each blade is pitched at a slight angle relative to theshank 1. The two blades are connected adjacent to their pointof crossingby a tie pin13 which is secured in the blades by upsetting the endsthereof as shown at 14.

In practice the points 9 are thrust against the hard earth or soft rockat the point where a hole is to be bored. The tool is then rotated aboutits longitudinal axis and the points will dig into the surface andloosen the ma-' terial which will be deflected upwardly along the curvedportions 6 into the space between blades 4. The advancing curved cuttingedge 8 will act with a shearing effect of the mate rial being bored andas the blades 4 diverge toward the shank 1 the straight cutting edges 7will act to gradually ream the bore so as to enlarge it and permit freemovement of the cutrnaterial upwardly between the blades and toward theshank 1.

When the tie pin 13 is in position it binds the two blades at theirpoint of crossing, each of the blades being notched as clearlyshown inFigures 1 and 3 so that they will interfit.

Each blade is a duplicate of the other and the cost of production isthus greatly reduced.

The blades can be of any desired length.

It h as been found in practice that by providing a tool such as hereindescribed a bore can be quickly produced in hard earth or soft rock sothat the structure is thus particularly adapted for producing holeswhere blasting is to be done under certain conditions.

'After a'certain amount of out material has accumulated between theblades 4 the tool can be Withdrawn, the cut material dislodgedtherefrom, and the tool then reinserted and actuated.

What is claimed is:

A boring tool of the class describedincluding a rotatable shank,separate opposed elongated blades secured thereto, each blade ibe-i ingbowed transversely and having itsfree end portion extending to apoint,said blades being crossed and in contact adjacent to their pointsand converging gradually to their Vpoi-ntof crossing, the free ends ofthe blades dlverging from their polnt of crossing, all

portions of the advancing edge of each blade fromthe point to the shankbeing disposed in the same plane, the planes occupied by the advancingedges of the two blades diverging from the shank, and a tie pinconnecting the blades above and binding them together at their point ofcrossing.

In testimony thatI claim the foregoing as my own, I have hereto affixedmv signature.

LUTHER sTRosNI'DER.

